Interchangeable punch and die and retainer for same



June 19, 1945. D. v. STELLIN INTERCHANGEABLE PUNCH AND DIE AND RETAINER FOR SAME Original Filed March 6, 1944 z r 5 6 2 4 1 g p 5 g M i 11 w ,Q 7 p11: fllllk lll.lr. jlillq L F L 90/77/72 1/ Sid/2n Af/omcy Patented June 19, 1945 INTERCHANGEABLE PUNCH AND DIE AND RETAINER FOR SAME I Domnic y. Stellin, New York, N. Y.

Original application March 6, 1944, Serial No.

525,233. Divided and this application November 20, 1944, Serial No. 564,291

4 Claims. (01. 164-118) This application is a division of my depending application, Serial No. 525,233, filed March 6, 1944,

now PatentNo. 2,364,401, issued December 5, 1944.

The present invention pertains to novel inter- I changeabl'epunches anddies and particularly to devices for accurately locating and retaining the punches and dies.

The principal object of the invention is to pro vide such retaining and locating means for punches and dies that are intricate and not necessarily round.- Hitherto it has been the practice to interchange round punchesand dies requiring no particular accuracy in being located. Obviously the means employed in that connection would not be suitable fornon-round or intricate parts.

' Another object of theinvention is to provide interchangeability of the character described by simple means requiring comparatively little time in making a change. This object of the invention is of great importance in urgent production,

as in war work, and in mass production where a given rate of output must be maintained in order to yield a profit. The loss of time incident to changing of punches and dies for any reason, such as breakage or need of sharpening, is sub- 1 stantial. A reduction of this loss by use of the present invention results in an important economy in the over-all operation,

Among the intricate punches and dies for which the invention is adapted are slitting punches. which cannot be properly located in a simple manner by existing devices. These punches are made of hardened steel, and when used on cutting hard material such as high carbon spring steel, the clearances between punches and dies is approximately of the thickness of the metal, and therefore accurate locating of punches and dies is essential. In many cases the effective height of the punches must be accurately maintained, or the dimensions of the resulting slit will be afiected. The locating means for a pair of slitting punches is described hereinafter.

Ingeneral the locator is so designed as not to require disassembling the main retainer or body that receives the punch or die. In the simplest form of the invention, the punch or die is formed with one or more keyways receiving a locating member fastened to the retainers. The fit of the locator in the keyways is accurate and permits no rotation or slipping of the punch or die. Moreover, the locator is quickly applied and maintains the punch or die accurately located.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing in which Figure 1 is an elevation, partly in section, of the device;

' Figure 2- is a section on theline 2-2 of Figure 1;

Figure3 is an elevation of a modification; Figure 4 is a section of another modification; Figure 5 is an elevation, partly in section, of a punch and die with a modified locator means, and

Figurefi is a bottom plan view of the punch shown in Figure 5.

designate corresponding parts throughout.

With reference first to the die assembly shown in Figures 1' and 2, there is provided the usual plate "I to which is attached a retainer II by means of alternate bolts l2 and dowels l3. The retainer has a recess which receives the die l5. Registering slots i6 and H are cut respectively in the retainer and die between the upper and lower planes of the retainer and extend entirely through the retainer to be exposed at opposite lateral surfaces thereof. A key I8 is fitted in the registered slots I6, I1. In this particular embodiment, the key is made of key stock and is of substantially square cross section.

Adjacent to each end of the slot IS, the retainer has a tapped hole I!) for the attachment of a spring clip or lock 20 to the retainer by means of a screw 2| passed througha hole 22 in the clip and into the hole IS. The member 20, is made "of spring steel and carries at its free end a pin 23 which enters a recess 24 in the adjacent end of the key I9. Both ends of the key are so recessed, inasmuch as a spring lock is mounted at each hole IS in the opposed surfaces of the retainer II. I

The key l8 may be replaced by a clevis pin 25 in Figure 3 havinga head 26 at one end and receiving a cotter pin 21 at the other end. Another device for the same purpose'is a bolt 28 having a head 23 at one'end and carrying a nut 30 at the other end, as in Figure 4.

A similar arrangement is employed for the punch assembly which comprises the usual plate 3| and retainer 32 having a recess 33 and attached to the plate by bolts 34 and dowels 35. The punch 36 and the wall of the recess 33 are formed respectively with registering slots 31 and 38 in which is inserted a key 33 as previously described. Likewise, each of the opposed surfaces of the retainer, at the ends of the slot 38, is formed with .a tapped hole 40 for attaching a sp -ing clip adapted for reception in a depression 42 in the adjacent end of the key, as previously se forth. As an alternative construction, the slo s in the retainer, die and punch may have a blind end and thus require a holding clip only at the single exposed end. 1

In the construction shown in Figure 5, the retainer l5 and die 48 are formed with semi-cy lindrical registering slots 48 and 49 which receive a cylindrical key 60, which may be made of drill rod. Each end of the key is retained by locking clips 50' mounted on opposed surfaces of the retainer 45 as previously described. Likewise, the punch retainer II and the punch 52 are formed with registering semi-cylindrical slots 53, 54 in which is inserted a cylindrical key II held at both ends as previously described.

Various forms of locatoralocating keys, etc., may be interchanged from one embodiment to another to suit requirements, wherever permitted by the construction involved.

Although specific embodiments of the invention have been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

What I claim is:

1. In a punch or' die assembly, a retainer, a severing member received in said retainer and having a portion projecting therefrom, said memher having a recess in its lateral wall and inward of said portion, said retainer having a similar recess adapted to register with the first recess. a key receivable in both recesses, a resilient loci:- ing member having one end fastened to said retainer, the other end of said locking member extending across and engaging an end of said key.

2. In a punch or die assembly, a retainer, a I

severing member received in said retainer and having a portion projecting therefrom, said member having a recess in its lateral wall and inward of said portion, said retainer having a similar recess adapted to register with the first recess, a key receivable in both recesses, a resilient locking member having one end fastened to said retainer, a projection at the other end of said locking member, one end of said key having an axial recess for receiving said projection.

3. In a punch or die assembly, a retainer, a severing member received in said retainer and having a portion projecting therefrom, said member having a recess in its lateral walland inward of said portion, said retainer having a similar recess adapted to register with the first recess, a key receivable in both recesses, resilient locking members each having one end secured to said retainer adjacent to opposite ends of said key, the remaining ends of said locking members extending across and eng ing respectively with the ends of said key.

4. In a punch or die assembly, a retainer, a severing member received in said retainer and having a portion projecting therefrom, said memher having a recess in its lateral wall and inward of said portion, said retainer having a similar recess adapted to register with the first recess, a key receivable in both recesses, resilient locking members each having one end secured to said retainer adjacent to opposite ends of said key, said locking members lying in planes perpendicular to the axis ofsaid key, the remaining ends of said locking members extending across and engaging respectively the ends of said key.

DOMNIC V. STELLIN. 

